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Symfony service referenced in YAML configuration does not exist
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<p>
This inspection detects references to non-existent Symfony services in YAML configuration files.
It validates that service IDs referenced in YAML actually exist in the service container.
</p>

<p>
The inspection checks for:
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<ul>
    <li>Service IDs referenced in YAML service definitions that don't exist</li>
    <li>Invalid service references in arguments and calls</li>
    <li>Service aliases that point to non-existent services</li>
</ul>

<p>
Example YAML configuration that would trigger this inspection:
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<pre><code>
services:
    my_service:
        class: App\Service\MyService
        arguments:
            - "@non_existent_service"      # This will trigger inspection
            - "@?optional_service"         # This is OK (optional)
            - "@@service_factory"          # This is OK (factory)

    another_service:
        class: App\Service\AnotherService
        calls:
            - method: someMethod
              arguments:
                - "@missing_service"         # This will trigger inspection

    # This will trigger inspection - alias points to non-existent service
    my_alias:
        alias: undefined_service
</code></pre>
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